Q.

The number of four digited numbers formed by 1, 2, 5, 6, 7 divisible by 25 is

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a

42

b

12

c

26

d

46

answer is B.

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Detailed Solution

Last two places can be filled in 2(25 or 75) ways.The first  2 places can be arranged in P2   3 ways. The number of ways = 2×P2   3 =12
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